clean up and add README

1 files changed, 41 insertions, 0 deletions

diff --git a/dissectors/pl2303.lua b/dissectors/pl2303.lua
new file mode 100755
index 0000000..6615166
--- /dev/null
+++ b/dissectors/pl2303.lua
@@ -0,0 +1,41 @@
+local proto = Proto("pl2303.bulk", "PL2303 Serial Data")

+

+local ep_dir_f = Field.new("usb.endpoint_address.direction")

+

+proto.fields.data_in_F = ProtoField.bytes("pl2303.bulk.data_in", "Data In")

+proto.fields.data_out_F = ProtoField.bytes("pl2303.bulk.data_out", "Data Out")

+

+local serial_tbl = DissectorTable.heuristic_new("pl2303.serial_data", proto)

+

+function proto.dissector(buffer, pinfo, tree)

+  if buffer:captured_len() < 1 then return end

+

+  local sub = tree:add(proto, buffer())

+  pinfo.cols.info:set("PL2303 Serial")

+

+  local ep_dir = ep_dir_f()() -- 0: h2d, 1: d2h

+  if ep_dir == 0 then

+    pinfo.cols.info:append(" out")

+    pinfo.p2p_dir = P2P_DIR_SENT

+    sub:add(proto.fields.data_out, buffer())

+  else

+    pinfo.cols.info:append(" in")

+    pinfo.p2p_dir = P2P_DIR_RECV

+    sub:add(proto.fields.data_in, buffer())

+  end

+

+  DissectorTable.try_heuristics("pl2303.serial_data", buffer, pinfo, tree)

+end

+

+function usb_protocol_key(class, subclass, protocol)

+  return bit.bor(

+    bit.lshift(1, 31),

+    bit.lshift(bit.band(class, 0xff), 16),

+    bit.lshift(bit.band(subclass, 0xff), 8),

+    bit.band(protocol, 0xff)

+  )

+end

+

+local bulk_table = DissectorTable.get("usb.bulk")

+bulk_table:add(usb_protocol_key(0xff, 0x00, 0x00), proto)

+bulk_table:add(0xffff, proto)